Cooking apparatus.



No. 884,288. PATENTED APR. 7,1908.

W. NASH.

COOKING APPARATUS.

APPLICATION FILED OGT.23.1906.

3 SHEETS-SHEET 1.

PATBNTED APR. 7, 1808. W. NASH. COOKING APPARATUS.

APPLICATION FILED 0GT.23. 19H6.

8 SHEBTSSHBBT 2.

Witwe/Saas @ff N 884 28s. PAPPNTPD APP. 7 1 o o W. NASH. 9 8 COOKING APPARATUS,

APPLICATION FILED OCT.23, 1906. A

3 SHEETS-SHEET 3.

/llllllllll .mmmmmmmmmmmm Witwe/ao @N2/MAZ Off/m WILLIAM. NASH, 0F DENVER, COLORADO- L `doom-Nor APPABAIrUs.

Bpecicatin of Letters latent.

lpatented April 7, 1908.

appresa-ion mea omherf 2a, isos. sean No. erases.'

To all 'whom 'it may concern:

Be a known that I, WILLI@ NASH, a ciszen of the UnitedStates, residing in the' city and county of Denver and State of Colorado,

have invented certain new and useful Im-4 ovements in Cooking Apparatus; and I do `eclare the followin to be al full, clear, and exact description o the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and iigures of reference marked thereon, which form a part' of this specification.

My invention relates to improvements in cooking apparatus in which the articles to be cooked are in thepresence of compressed air, the pressure of the air within the ovens being automatically regulated. The apparatus also includes means for producing .a circulationof the air through a heating apparatus located outside of the cooking ovens, and also 4means for automatically regulatin the degrec of heat in theovens, throug the instrumentality of thermostats located in the circuits of electric heat generators.

The invention will now be described in detail reference bein made -to the accompanying drawin in W `ch is illustrated an em- 4bodiment t ereof In this drawing, Figure 1 isa top plan view illustrating my improved apparatus provided with three ovens. Fig. 2 1s a side elevation of .the same. Fig. 3 is a section taken through one of the ovens. Fig. 4. is a view showing an electric heater composed of three.

elements one for each of the ovens. In this view the face plate is removed from the Fig. 5 is a vertical section taken through the heater.

. The same reference characters indicate the same parts in all the views.

Let the numeral 5 desi ate a suitable stationary base upon whic ismounted three ovens which I will .designate A, Bi and C, respectively.' These ovens are preferably constructed as shown in Fig. 3 of the drawing,

that is to say having thelr walls composed of interior and exterior plates 6 and 7 providedwith a heat insulatmgfllling 8 which maybe composed of felt an asbestos or any other suitable. filling adapted y.to retard exterior heat radiation.

In the upper part of each oven is located althermostat bar 9 composed of two metal 'plates possessing the property of expansion extremity of this bar is secured to? a spindle 10 which is journaledin the top Wall. ofthe oven and protrudesabovethe same. The exposed extremity of this spindle is provided with an arm 12 terminating in a pointer 13 .located adjacent a graduated scale plate llt (see Fig` 2),. The opposite extremity of this bar is located adjacent `a contact pin 15 mounted on a contact y1.6 which also through the wall of the oven, .its outer e'xtremity being exposed and provided with .a binding screw 17 for connecting a circuit wire 18. The spindle l() is also provided Wire 19 with the spindle 10. The wire 18 and contraction inl-unequal degrees. One-- witha similar screw which connects a circuit.

leads to a main conductor 20 connected with one pole of an electrical source 21 while Athe Wire 19 leads tol a contact 22 of an electrical heater 23. The other contact, namely 2.4 of this Aheater is connected with the opposite pole of the electrical source `by wires 25, 26 and 27.

vAs shown in the drawin there are three distinct electrical heaters W 'ch I will designate 23, 23- and 23B. The thermostat of each oven is connected with one of these heaters and the circuit wires as Well as the` I other elements of the thermostat circuit may be designated'by the same reference charac' ters.

limit as indicated by the ointer 133 on .the graduated bar, the bar w' move away from the contact 15and" break the circuit. through the heater. When, however, .theoven cools suliciently to require .additional heat, the

When the heat of Aany voven reaches the bar en ages the contact 15 and again closes the sai circuit thus automatically regulating the degree of heat.

An l'mportant feature of my improved coin-V l that vthe pressure of the air'withi-n the oven and in contact with the meat, is such. as to prevent the escape of the julces `and other elements which under ordinary cir-. cumstanoes are :vaporized and escape 'from struction, consists in the apparatus whereby the air Within the ovens is maintained at. a

It has been hfound* the meat during the cooking operation.- In order to maintain this pressure, I employ an air ump connected with each'oven, the latter ein alsol rovided with a checkfvalve 5 which aows the air -to escape after the desired or predetermined pressure is reached. By means of this pump the air is caused to circulate throughthe oven and also through the electric heater with which the oven is connected, the air being assed around the heating coils which may e of the construction shown in Figs. 4 and 5. This circulation of the air is also an important feature.

-Any suitable apparatus maybe employed for this pur ose.V In the drawing a pump 28 is connecte by means of aipe 29 with a chamber 30 of oneof the e ectrical heater units (see Fig. 5). The ump is also provided with another pipe dlesi nated 31 leading to one of the ovens by a ranch pipe 32 the pump being operated to take air from the heater and deliver it tothe ovens. As shown in the drawing there are three pumps each of which is provided with a similar connection, the pipes connected with each pump being desiBglnated by the same reference characters. In `g. 2 there are three distinct pipes 31, but on the lower part ofthe view these pi es are located in the same plane and therefgre give the appearance of la single pipe. Each pipe 31 is provided with a valve 33 which may be employed for regulating the supply of air to the oven. y

vEach oven is provided with a short outlet pipe 34 in which is located a check valve'35 so regulated as to `permit the escape of the air from the oven after the pressure reachesthe predetermined limit. Beyond the check `valve 35 a pipe 36 leads to one ofthe heater elements. By virtue of this arrangement each pump keeps u a circulation of. air thro h the oven un er the desired pressure. The circulation of air through the oven and through the heating chamber 30, maintains the tem erature of the oven at the proper degree, t 's degree being automatically regulated by the thermostat as` heretofore explained. Each oven is provided with a pressure gage 37 and a thermometer 38 both ofl whlch are exposed to view at the-top of theI oven. Each heater or each heater unit is provided with an inlet check valve 39 for supplying atmospheric air to the heater whenever the pressure is diminished suffi'- ciently to require additional air. The object of this check valve is to sup ly any loss of air that may occur incident to eaks 1n the system. Each oven is provided with a door 40 hinged at its lower edge as shown at 41, and locked in the closed position by a bar 42 pivoted on the oven at one extremity as shown at 4 3, its op osite extremity -be` adapted to engage a oop 44. Each locking bar'42 is provided with a hand screw 45 for 65 tightening the door of the oven sufficiently esmas to make the latter practicall air tight. This hand screw is -threaded in t e bar and bears against the center46 of the door from which radiate reinforcing webs 47.

As shown in the drawing (see Fig. 1) the' pum s are all operated by an electric motor 48 whose shaft 49 is connected in operative relation with the pum s.

From the foregoing description the use and operation of myimproved apparatus will be readil understood. The thermostatbars 9 may e irst regulated tocause them to leave the contacts 15 when the oven reaches .the desired degree of temperature. The motor 48 is then set in motlon andthe pumps actuated to su ply the ovens with com- `ressed air. W en this air has attained the esired degree of pressure within the ovens, it is automatically returned to the heating 'chambers and again passed to the ovens coming in contact with the heating coils 50 of the heat enerators. Each oven is interiorly provi ed with a deflecting plate 51 occupying a position in ront'of each nozzle or branch pipe '32, Wherebythe air as it enters the oven is automatically distributed.

The walls of the heat generator are insulated as shown at 23B, to revent heat radia- Ltion and make the cham rs containing the heat enerating mechanism, storage reservoirs or the hot air whereby there is ractically no loss of heat within the cham rs of the generator. This makes the apparatus very'economical since the heat is conservedl to the eatest' possible extent thus cutting down t e expense of the generator and reventing sudden changes of temperature om external influences.

Having thus described my invention, what I -claim is: l

1. In cooking apparatus, the combination with an oven, of means for supplying the same with hot air under ressure, comprising an air pump connected) with the oven, a heater connected with the oven .and with the 110 pump, a check valve inte osed between the oven and the heater where y the airis maintained ata predeterminedv pressure in the oven', the oven, the heater and the pump being connected to cause the air to travel in 11'5 an endless circuit through the said elements, and meanslocated in the oven for maintaining the' heat at a predetermined degree.

2. In cookingl apparatus, the combination of an oven, an'e a pipe system connecti all of the sald eleL ments whereby the air 1s circulated by the Y pump through the oven and heater in an endess circuit, and aV check valve inter osed between the oven and heater for maxntaini 125 the air within'the oven at a predetermined, v pressure.

3. In cooking apparatus, the combination with an oven, ofa heater, a pump, an air ectrical heater, an air pump, I

v second air pipe leading from the pump to the oven, and' a third air ipe leading.. from the oven to the heater, thellast named pipe being provided with a check valve between the oven and the heater whereby the air within the oven is maintained at a predetermined pressure. I

4. The combination with an oven, of a heater, a pump, a pipesystem connecting the heater with the pump, the latter with the oven, and the oven with the heater whereby a circulation of hot air by the pump through the oven and heater in an endless circuit may be maintained, and the connection between the oven and the heater being provided with a check valve whereby the air within the oven is maintained at a predeten.

mined pressure.

5. In cooking a paratus, the combination wlth an oven, an e ectrlc heater, an air pump,

n a pipe system connecting the heater withthe pump, the latter with the oven and the oven with the heater, a thermostat connected with the oven and having its movable element located in the circuit of the heater whereby the temperature of the oven may be controlled, and a check valve located in the air pi e between the oven and the heater for regu ating the pressure within the oven.

6. The combination with an oven, of a lheat generator including a chamber having insulated Walls to prevent loss of heat by radiatlon, a pump, a pipe stem connecting the heater with the pump, the latter with thel oven and the oven.y with the heater whereby a circulation of hot air through the oven and heater in an endless circuit'may be maintained, and the connection between the oven and the heater being provided with a check valve vvwhereby the air within the oven is maintained at a predetermined pressure.

-7. In cooking apparatus, the combination o f an oven, an electrical heater located outside of the oven, a pump, a pipe system con- Anecting the pump, the oven and the heater to cause the air t'o pass through the saidlelements in an endless circuit, and means interposed between the oven and heater for maintaining the air within the oven at a predetermined pressure.

8. In cooking apparatus, the combination of an oven, anelectric circuit, a heater located in the circuit, a pump, a pipe system connecting1 the heater-with the pump, the ump Wit the oven, and the latter with the lieater whereby the air may be caused to travel through the oven, the heater and the pump in an endless circuit, means located in the voven and connected with the electric circuit whereby the last named circuit may be automatically broken when the heat reaches a predetermined degree within the oven, and a check valve located between the oven and the heater whereby the air within the oven is maintained at a predetermined pressure.

.9. In cooking apparatus, the combination of an oven, an electric circuit, a heater 1ocated in the circuit, a pump, apipe system tomatically controlled by the temperature of the oven, and a check valve located between the oven Aand the heater whereby the air within the oven is maintained at a predetermined pressure.

In testimony whereof I affix my signature in presence of two witnesses.v

WILLIAM NASH.

Witnesses DENA NELSON, OTTO E. HoDDrcK. 

